about mutifunction USB device

[jiang du]

http://lists.freebsd.org/pipermail/freebsd-current/2003-November/014489.html

Luckily i saw your words on the page above, i am
getting started to learn mutifunction USB device
developing,would you please  introduce me some
resources  like websites for me to learn from. 

or could you pls talks about how to develop a
mutifunction USB device ?

Thanks ahead.

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